Hotspot documentation

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Are there any available research papers which can shine some light on implementation of Hotspot ? I'm now trying to delve inside it's code, with help of -XX:+PrintIdeal, grep through cpp files etc, but having some general overview of compilation stages etc would help me a lot.

More technical document is, the better. If you have something what references actual cpp files, it would be just great. Or maybe you can open some of your internal documentation to wider public ?